Study On U(Ⅵ) Removal Properties Of Functionalized Hyper-crosslinked Polymers And Their Carbonized Material

Along with the rapid development of nuclear energy,how to cope with the contamination of U（VI）in aqueous solution has become one of the inevitable crisis treatment events in the human living environment nowadays.Treatment means include adsorption,reduction,electrochemical,photocatalytic and other methods.Among the carrier-dependent methods in the field of uranium contamination removal in recent years,hyper-crosslinked polymers have been widely explored and applied because of their simultaneous porosity and strong stability,and ease of functionalization.In the introduction,the materials and means of recent treatment of uranium contamination,the synthetic routes of functionalized hyper-crosslinked polymers,and some examples explored in the removal of U（VI）are presented.Therefore,this paper presents two materials for the recovery of U（VI）based on hyper-crosslinking synthesis strategies.Firstly,cyano-modified the hollow organic porous nanospheres（HOPNs-CN）were prepared by the synthesized polylactide-b-polystyrene（PLA-b-PS）diblock polymer and benzeneacetonitrile as the functional monomer as the precursor through the Scholl-coupling reaction via hyper-crosslinking self-assembly process.Then amidoxime-modified the hollow organic porous nanospheres adsorbent（HOPNs-AO）was obtained by further modification.The adsorbent exhibited excellent adsorption capacity and high selectivity for U（VI）by introducing special functional groups to coordinate with uranyl ions and creating a multi-stage pore structure to improve mass transfer and adsorption capacity.The second one is a one-step synthesis of direct carbonization to obtain nitrogen-doped carbon materials loaded with nanometer zero-valent iron by a hyper-crosslinking strategy of carbazole and benzylamine catalyzed by Fe Cl₃.After hydrogen peroxide treatment,the hydrophilicity is improved and the adsorption efficiency and capacity are greatly enhanced.Fe0@N-HCP-H2O2containsγ-Fe and appropriate amount of nitrogen doping,which can effectively reduce the leaching of iron.The easy preparation process,high yield and magnetic separation of this material have great advantages in the future application and industrialization.